Trolley pole



sept. v1s, 1925. 1,553,424

3 R. W. YOUNG TROLLEY POLE Filed June 29, 1922 Figi.

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lo mvENTo v ES: n/w'f Rober-1 vv. Young.

l Y 'JM .Il /OI f ATTRNEY Patented YSept. 15,019,25.

.UNITEDhSTTS ROBERT W., YONG, or PITTSBURGH, rENNsviivANIA, AssIGNoR To `R. n. NTTAL l COMPANY, A CORPORATION or PENNsYLvAN1A-- y rROLLEY POLE. `Y

.Y Appiieationniea June 29, 1922. serial. No. 571,751.

T 0 all whom it may cof/toorn.'

Be known that I, ROBERT XV. YOUNG, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful ImprovementJ in Trolley Poles, of which4 the following is a speciiication. 'i

My invention relates to trolley poles and particularly to means for detachably mounting a trolley harp and current collector thereupon. i

rMy invention has-for its object the provision of means whereby the current collector may be automatically detached from thevpole upon the imposition thereupon of an abnormal stress, as when the current collector leaves the wire and is caught upon, or is thrown against, the o-verhead structure.

A further objeotof my invention is the provision of an improved form of mounting for a current collector and its harp whereby it may be quickly and conveniently inserted into position upon the trolley pole or removed therefrom.

As shown in the accompanying drawings,

Figure 1 is a view, in side elevation, of a portion of a trolley pole embodying my invention;

Fig. 2 is a view thereof in rear elevation, and

Fig. 3 i's a view taken on the line III-III of Fig. 1.

A trolley pole 4 maybe mounted upon the roof of a vehicle (not shown) in the usual manner and is provided with a pole head 5 that supports a swivel harp 6 which carries a trolley wheel 7. The pole head 5 has rearwardly-extending lugs 8, as indicated more clearly in Fig. 3.

The trolley harp 6 is provided with a base portion 9 through which a bolt 10 extends. I he bolt 10 is of such length that it extends to a point below the lugs 8 of the pole head 5 and is provided with a nut 11 on itsy lower end. The bolt serves as a swivel'member, or a pivot pin, for the harp 6.

In order that the bolt 1() may be detachably retained in position in the pole head 5, four pins 12 are provided. The pins 12 are slidable in slots provided in the lugs 8 and are normally biased inwardly by flat springs 13 that are secured to the pole head 5 by means of rivets 14. The inner ends of the bolts are rounded so that, when the vehicle isy traveling in a forward direction,l

the bolt 10, upon the imposition of anabnormal thrust upon the harpr or the trolley wheel, may force'the pins 12 outwardly,

against the compression of lthe springs 13,

vthus permitting the'harp 6to be freed from 'the pole.

A. chain, or a rope, 16-is provided to avoid- `the necessityofthe operator of the vehicle limiting the trolley wheel shouldit become detached at night,vor in an unlighted place, such, for example,as in a coal mine. yOrdinarily, the harp will not be heldin the overhead structure afterit is detached from the pole head, but the chain 16 may be of limited strength in order that it will break under excessive strain. Y

rl`he harp G is provided with depending flanges 18 and 19 against which theV ends of a centering spring 20 may abut to yieldingly hold the harp inrproper alinement with the trolley vpole 4,

The pole head Y 5 shoulders 21 against which the ends of the springs 13 may abut to prevent such springs from turning on the rivets 14.r

It will be apparent tha-t, instead of'providing yielding retaining means at the rear of the bolt 10, a rigid structure of fragile i 85 .vice but I prefer a yielding structure, iii- Vr material may be providedas al safety deasmuch as'itis thereby possible to readily Adetach and replace the trolley harp upon the pole without the` necessity of employing nuts and bolts, or simi-lar devices.

Various modifications in detail and arrangement may be made without departing from the spirit and scope of the invention, as define-d inthe accompanying claims.

I claim as my invention:v 1. In combination, a. trolley pole provided with a headv having an opening extending rearwardly from its central portion, a yielding member for closing the openingv and av trolley harp having a bearing portion eX-` tendinoV into the said opening, in front Of the yie ding members. 2. The combination with a trolley pole is y ,provided with y provided with a headhaving a rearwardly www therein, a current colleotor'having a vportion extending into said opening, and spring-held stop members for holding the Vcurrent kcollector in position in the opening.

4. The combination With a trolley pole and a current collector supported thereby,

of means disposed across a portion ofthe said support for retaining the Collector in position under normal stresses but 'of such strength that the collector will become dismounted upon the imposition of excessive stress thereupon.

5. The combination With a trolley pole provided-With a pole head, of rearwardlydisposed extensions on the pole head, a trolvley harp, a pin extending through the trolley harp and between the said extensions, a plurality of pins slidably supported in the extensions and disposed transversely of the first vnamed pin, the said transverse pins being provided with rounded surfaces that are engaged by the other pin; Y

6. The combination with a trolley pole provided With a pole head, rearwardly-disposed extensions on the pole head, a trolley harp, a pin extending vertically through the trolley harp and between the said extensions, a 'plurality of pins slidably supported in the extensions and ydisposed transversely of the vvertical pins, the saidtransverse pins being I have hereunto 

